package com.onlinevideo.filter;

import com.onlinevideo.entity.User;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 过滤掉未登录用户
 * 即判断session里面是否存在"user"，为空则过滤掉
 */
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        User user = (User) request.getSession().getAttribute("user");
        if (user == null) {
            response.sendRedirect("#");
            return;
        }
        filterChain.doFilter(request,response);
    }

    @Override
    public void destroy() {

    }
}
